4.4 Conductivity Calibration
Before attempting a Conductivity calibration, ensure that the 90-FL has been set up correctly
according to sections 4.1 to 4.3.
1. Plug the Conductivity sensor into the Cond/Sal socket.
2. Rinse the Conductivity sensor in distilled water. Shake off as much water as possible. Blot the
outside of the sensor dry. DO NOT BLOT THE ELECTRODE WIRES.
Zero Calibration
3. Let the sensor dry in air.
4. Select Conductivity Calibration ( →→ F1:Calibrate →→ F2:Conductivity).
5. The 90-FL will recognise the low conductivity signal and attempt a Zero calibration. For
example…
0*01uS 25.0
o
c
Cond. ZERO Calibration,Press Enter
6. When the reading has stabilised at or near zero, press to calibrate or to quit. The “ ∗ ”
will not be removed after a zero calibration.
Standard Calibration
7. Place the Conductivity sensor into a sample of Conductivity standard. Ensure that it is
immersed correctly, as per the diagram below.
DO NOT place the sensor directly into the bottle of standard. Discard the used sample of
standard after use.
8. Select Conductivity Calibration ( →→ F1:Calibrate →→ F2:Conductivity). The
calibration screen will be displayed with the Conductivity standard to be used. For example…
2*86mS 25.0
o
c
Cond. 2760uS Calibration,Press Enter
9. When the reading has stabilised, press to calibrate. The “ ∗ ” will now be replaced by a
decimal point if calibration was successful.
10. The 90-FL is now calibrated for Conductivity and is ready for use in this mode.
Ensure that the sensor is immersed at least as deeply as per the diagram in step 7 for all sample
measurements.
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